I'm using these to connect the microcontroller to a Digiten G1 water sensor that comes with a 3-pin JST-SM connector. I used an appropriate crimping tool and crimped a few pins onto a wire, but when trying to fit them into the JST package, the pins are very "problematic" to get them all the way in. I carefully adjusted them with pliers to make sure they weren't wrinkled or anything. Apparently the angle of the small metal box that fits in the JST case is very important. Should be very straight and tends to flex a bit when you crimp the rear lugs.
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